This thing's been a work in progress for almost a year now.
Before all you old skool anti-"black gun" types cast the first stone, I'm not going to BS myself and say I can use it for hunting or home defense or whatever... I just wanted a gun that was cool, lightweight and fun to shoot.
Initial range report was consistent 4-4.5" groups at 100yds with 5 rounds. I know this sounds unimpressive, but the MP is only capable of 3MOA, so I'm satisfied with that for now. I'm sure it will improve with practice.
I'm open to feedback, so fire away!!

Very nice SUR you got there. 4 - 4.5" groups at 100 yds does not sound right though, you should be able to get sub 3" all day long. Were you shooting off hand or from a rest? Have you shot it with the BUIS. What grain ammo are you shooting, what's the barrel twist rate?

I was shooting with the mag resting on the bench. The barrel's a 1:9" twist and i was using 40gr Remax ballistic tip factory ammo.

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Just a hunch but next time out try a slightly heavier bullet, 55gr or 62gr. A 1:9 might be borderline for using a 40gr load, especially with a 16" barrel. The ballistic tip may keep the round from vaporizing from the overspinning but accuracy may be suffering. A sandbag or a range bag will also provide a more stable rest than the mag. Have fun...

Thanks for the suggestions. I know the rifle's capable of sub-MOA accuracy, I was referring to the sight. Also, as far as the bullet weight issue, I still have plenty of 55gr FMJ I'm sure I can put to good use.

Have you tried moving the forward grip further forward on your rail? I used to be a big user of the magwell until someone suggested using a stubby grip. That helped steady the rifle a lot. Then I tried a AFG at the furthest forward position. It makes for a very goog control and a steady rifle.

Although Spitty's build is a tad bit more involved than the one I did.

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a bit...

Yep, there aren't any black-rifle bashers here that I've seen. In fact, any reference to "assault" is pretty much shouted down. I just finished my own build and I'm 6 days from my 1st range trip. I'll be just using iron sights, but I can't wait.

Congrats on your new family member. Keep up the good fight and welcome to FTF! I must have missed your intro thread.

I put the MVG toward the rear so I can still use the flat part of the handguard for more accurate long shots. From my experience, generally the further back the grip is, the easier the rifle can be maneuvered in close quarters, but you'll be sacrificing accuracy at long range while using the grip.

I was taught to use the magwell will in the infantry but have since changed to a grip further forward on the handguard using an AFG or stubby VG as a handstop. Ive found that when using proper form this style gives me added mobility and quicker more accurate follow-up shots from distances near and far. It also makes my ARs feel lighter/more balanced.